Brandon Lavigne

The Jetpack visibility module is appended to the bottom of all widgets (including 3rd parties). This plugin adds actions/filters so that plugin developers can add additional filters based on thier needs. See “Jetpack Widget Visibility – Query Args” and “Jetpack Widget visibility – WPML Languages” as two examples of what you can do with this enhancement.

Jetpack Widget Visibility Extended

This plugin is a proposed enhancement of the Jetpack Widget Visibility module.

cordoval

This plugin allows for the integration of Symfony2 components into WordPress. PHP5.3 is desired but not mandatory.
I advise you strongly read this [article] (http://www.craftitonline.com/2011/09/wordpress-symfony2-powered-the-ultimate-wp-plugin/) before posing any question.
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WordPress Symfony2 Wedlock

This plugin extends Wordpress capabilities with Symfony2 components seamlessly.

Jetpack Widget Visibility Extended vs WordPress Symfony2 Wedlock